Pixel Circuit Voltage Control for Narrow Bezel LED Displays
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Solution Overview
Problem
Existing LED display technologies face challenges in achieving high resolution and large size due to the offset of the main peak emission spectrum under different currents, which limits the use of pulse-width modulation (PWM) for passive matrix (PM) driving, making it difficult to achieve a narrow bezel design.
Innovation Solution
A pixel circuit with a light emitting diode (LED) and a switching sub-circuit that controls the emission state based on the magnitude and duration of the effective voltage level of a display signal, using a switching transistor, emission control transistor, and reset transistor to manage the LED's emission, allowing for reduced wiring and enabling a narrow bezel design in display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PWM method is employed for passive matrix driving, then LED emission spectrum offset under different currents is addressed, but display resolution and size are limited
Solution Approach 1:
The patent changes the control parameter from pulse width modulation to voltage level modulation. By controlling the magnitude and duration of voltage levels applied to the LED, the invention achieves precise control over emission spectrum and intensity without the limitations of PWM-based passive matrix driving, enabling higher resolution and larger display sizes.
Solution Approach 2:
The invention implements dynamic control of LED emission by adjusting both the magnitude and duration of voltage levels in real-time. This dynamic parameter adjustment allows for precise control of emission characteristics while supporting high-resolution displays with large numbers of controllable pixels.
2Ease of operation
If traditional LED display wiring is used, then basic display function is achieved, but bezel width cannot be minimized
Solution Approach 1:
The patent merges multiple control functions into a unified voltage control mechanism. By combining brightness control, grayscale control, and emission timing into a single voltage level and duration control system, the invention reduces the number of required signal lines and control circuits, enabling narrower bezels while maintaining full display functionality.
3Illumination intensity
If high current is applied to LED, then brightness is increased, but emission spectrum peak offset occurs
Solution Approach 1:
Instead of controlling brightness through current magnitude alone, the invention changes the control approach by using voltage level magnitude and duration as control parameters. This allows for achieving desired brightness levels while maintaining stable emission spectrum peak position, as the voltage-controlled approach enables more precise regulation of LED operating conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for a display panel with large size and high resolution, achieving efficient control over brightness and grayscale, and enabling the creation of a video wall with reduced wiring, thereby improving display performance.
Implementation Method 1
a light emitting diode having a first electrode configured to receive a first power supply voltage and a second electrode configured to receive a second power supply voltage
Implementation Method 2
the emission state varies based on a magnitude and a duration of an effective voltage level of the display signal
Data Source
AI summary
The present application provides a pixel circuit and a method for driving the same, a display panel and a video wall. The pixel circuit includes a light emitting diode having a first electrode configured to receive a first power supply voltage and a second electrode configured to receive a second power supply voltage; and a switching sub-circuit having a first terminal electrically coupled to a display signal terminal, a second terminal electrically coupled to the second electrode of the light emitting diode and a control terminal electrically coupled to a scan signal terminal, and configured to control an emission state of the light emitting diode based on a display signal provided from the display signal terminal, in response to a scan signal provided from the scan signal terminal. The emission state varies based on a magnitude and a duration of an effective voltage level of the display signal.